Set network tuning parameter values in AIX

Use the no command to configure network tuning parameters. The no command sets or displays current or next boot values for network tuning parameters. This command can also make permanent changes or defer changes until the next reboot.

Whether the command sets or displays a parameter is determined by the accompanying flag. The -o flag performs both actions; it can either display the value of a parameter, or set a new value for a parameter.

We used the no -a command to list all settings and the following commands to set the values:

• no -o tcp_keepidle=600
• no -o tcp_keepintvl=10
• no -o tcp_keepinit=40
• no -o sack=1
• no -o rfc1323=1
• no -o tcp_sendspace=524176
• no -o tcp_recvspace=524176
• no -o sb_max=1048352
• no -o tcp_mssdflt=1448

When you use the no command to change parameters, dynamic parameters are changed in memory and the change is in effect only until the next system boot. At that point, all parameters are set to their reboot settings.

To make dynamic parameter changes permanent, use the -r or -p options of the no command to set the options in the nextboot file. Reboot parameter options require a system reboot to take effect. For more information about this topic, refer to AIX 5L Practical Performance Tools and Tuning Guide>, SG24-6478.

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